Sure, but promise me you will be a sweet girl tonight
Sounds kinda weak for my taste, like you expect something from her in exchange for you picking her up, also kinda hints that girls haven't been sweet with you for some reason... But that is just me (could be good depending on the context... But I think it's likely to backfire, way more than some good teasing, at least)
if you don't know where things are at or are having trouble with not taking girls seriously, a bit of teasing works wonders to set a good playful tone. It works when she's good, when she's bad, it works Monday through Sunday, rain hail or shine.
Yup, op is getting too invested in this date, he's overgaming (or at least trying to) her on text and this lead to some weird thinking behind his texts... If this girl really wants to go out with him, him picking her up or not shouldn't matter at all. If it's pratical for him, he can do it, no biggie, if not, tell her you can't and whatever, if she doesn't show up because of that, she wasn't even that invested to begin with...
I understand trying to have your best shot of taking a girl home and having the date go well for you, but not to the point were you're obsessing over what is the best answer that is gonna give you a 2.4% increase of chance of her sucking your D with minimal risk...
Because there ain't such thing. There's just too many variables, you barely know this girl, I'm assuming, since you haven't even taken her out, so you can't possibly know exactly what the best answer is. This whole thread just shows me he probably doesn't get that many chances with girls of her caliber and he's too invested on it to begin with, so his odds are low to begin with, or he's just trying to overgame for some reason, which it just annoying at this point (everyone here gave solid advice and he still asking about minute details). If that is like the hottest girl you had a shot with ever, or in quite some time, it's fine to want it to really go well, just don't get too attached to the outcome, because shit happens, even when you have experience, and when you don't, you likely will fuck up, and overanalysing everything is just gonna make it worse.
My advice for op is just chill and go with your guts, if it doesn't go well, next time you know what not to do with a girl like her